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Abstract

The Phase Doppler Anemometer (PDA) technique measures particle
diameter assuming sphericity. A means for detecting nonsphericity
has usually been implemented in commercial PDA systems to avoid sizing
errors if the sphericity assumption is not valid. In the present
research the response of standard and planar PDA systems is examined
experimentally in more detail by passing nonspherical droplets of known
shape through the measurement volume. The effectiveness of
nonsphericity detection schemes can be evaluated, and furthermore the
influence of the droplet oscillations on the frequency and phase
evolution of individual signals can be quantified. The light
scattering from such particles has been simulated by using geometric
optics, and the computed response of standard and planar PDA systems
agrees well with the experimental observations. We conclude with
some remarks concerning the possibilities of characterizing the
nonsphericity with PDA systems.

References

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